Roger Bolingbroke (died 18 November 1441) was a 15th-century English cleric, astronomer, astrologer, magister and alleged necromancer. He flourished in the first half of the 15th century. He was tried, convicted and executed for treasonable witchcraft on the person of Henry VI of England. Bolingbroke was a person of great intelligence and learning. He was part of the household of Humphrey of Lancaster, 1st Duke of Gloucester, and was the personal clerk to Eleanor Cobham, the Duke's wife. Bolingbroke was the best known of the three scholars implicated in the "conspiracy" to bring about the death of King Henry. He was described as a gret and konnyng man in astronomye and renowned in all the world .